Hydrianum

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Hydrianum
Hydrianum ovale in Rabenhorst 1868.jpg
Hydrianum ovale
Scientific classification OOjs UI icon edit-ltr.svg
Clade: Viridiplantae
Division: Chlorophyta
Class: Chlorophyceae
Order: Chlamydomonadales
Family: incertae sedis
Genus: Hydrianum
Rabenhorst, 1868
Type species
Hydrianum ovale
Rabenhorst [1]
Species [1]
Synonyms
  • ChlororhabdionF.W.Jane [2]

Hydrianum is a genus of green algae, in the order Chlamydomonadales. It is found in freshwater habitats such as marshes and bogs, as an epiphyte on plants or other algae. [1] It is common, but most likely overlooked due to its similarity with similar genera such as Characium . [3]

Contents

Description

Hydrianum consists of solitary or clustered cells attached to a substrate, via a mucilaginous pad or a stipe. Cells are cylindrical, oval, or spindle-shaped; in some species they are distinctly curved. Cells are uninucleate (with a single nucleus), they contain a single parietal chloroplast (or multiple when older). Pyrenoids are generally absent but may be present in a few species. [1]

Asexual reproduction occurs via the formation of zoospores; the zoospores are released through a rupture near the apex of the cell wall, while one zoospore stays behind and develops into a new vegetative cell. Zoospores have two flagella and a single chloroplast. After swimming, the zoospores settle and develop into a new cell. Sexual reproduction has not been observed in this genus. [1]

Members of Hydrianum with a pyrenoid can be confused with Characium, but in Hydrianum the zoospores exit subapically or apically, while in Characium the zoospores exit through a lateral opening. Additionally, in Hydrianum a zoospore may remain in the sporangium and develop into a new cell. The genus is also similar to Characiopsis , which generally lacks pyrenoids, but is unrelated. [3]

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<span class="mw-page-title-main">Chlorococcaceae</span> Family of algae

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<i>Carteria</i> Genus of algae

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Characiochloris is a genus of green algae in the family Characiochloridaceae. Characiochloris is epiphytic on freshwater algae, or found in soil.

Characiopodium is a genus of green algae in the family Sphaeropleaceae. It occurs in soils.

Characiosiphon is a genus of green algae in the family Characiosiphonaceae. It contains a single species, Characiosiphon rivularis.

<i>Characium</i> Genus of algae

Characium is a genus of green algae in the family Characiaceae. It is very commonly found in freshwater habitats, where it is attached to phytoplankton or zooplankton.

Lobocharacium is a genus of green algae in the family Characiosiphonaceae. It contains the single species Lobocharacium coloradoense. It has been isolated from a pond in Colorado, United States.

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<i>Planktosphaeria</i> Genus of algae

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Vitreochlamys is a genus of green algae in the family Chlamydomonadaceae. It is sometimes known by the name Sphaerellopsis, published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by SphaerellopsisM.C.Cooke. It is commonly found in freshwater habitats.

Characiellopsis is a genus of green algae in the family Characiaceae. Two species are known: Characiellopsis anophelesii and Characiellopsis skujae.

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<i>Desmatractum</i> Genus of algae

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<i>Chlorokybus</i> Genus of basal green algae

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Cecidochloris is a green algae genus in the family Chlorangiellaceae. It occurs in freshwater. However, it has only been reported so far from Europe, with an additional species from India that is incompletely described.

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<i>Apiocystis</i> Genus of algae

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References

  1. 1 2 3 4 5 Guiry, M.D.; Guiry, G.M. "Hydrianum". AlgaeBase . World-wide electronic publication, National University of Ireland, Galway. Retrieved 2022-02-25.
  2. Guiry, M.D.; Guiry, G.M. "Chlororhabdion". AlgaeBase . World-wide electronic publication, National University of Ireland, Galway. Retrieved 2024-11-30.
  3. 1 2 Komárek, J.; Fott, B. (1983). Chlorophyceae (Grünalgen), Ordnung Chlorococcales. Das Phytoplankton des Süßwassers (in German). E. Schweizerbart'sche Verlagsbuchhandlung. p. 1044.